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p-Block Elements (Group 13 & 14) · Question 15

NEET 2016 (Phase 2)MCQEasy📈 Topic in 50% papers+4−1
1

Boric acid is an acid because its molecule

  1. contains replaceable H+ ion
  2. gives up a proton
  3. accepts OH- from water releasing proton
  4. combines with proton from water molecule.

Answer

(3) accepts OH- from water releasing proton

Solution

As per NCERT, orthoboric acid is a weak monobasic acid. It is not a protonic acid but acts as a Lewis acid by accepting electrons from a hydroxyl ion:

B(OH)3 + 2HOH [B(OH)4]- + H3O+

It accepts OH- from water, releasing a proton.

Answer: (3)

NEET 2016 (Phase 2)

Keep practising — p-Block Elements (Group 13 & 14)

2

AlF3 is soluble in HF only in presence of KF. It is due to the formation of

  1. K3[AlF3H3]
  2. K3[AlF6]
  3. AlH3
  4. K[AlF3H]
NEET 2016 (Phase 2)
3

The stability of +1 oxidation state among Al, Ga, In and Tl increases in the sequence

  1. Al < Ga < In < Tl
  2. Tl < In < Ga < Al
  3. In < Tl < Ga < Al
  4. Ga < In < Al < Tl
AIPMT 2015
4

Which of the following is electron-deficient ?

  1. (BH3)2
  2. PH3
  3. (CH3)2
  4. (SiH3)2
NEET 2013
5

Which of the following structure is similar to graphite?

  1. B4C
  2. B2H6
  3. BN
  4. B
NEET 2013
6

Which of these is not a monomer for a high molecular mass silicone polymer?

  1. Me3SiCl
  2. PhSiCl3
  3. MeSiCl3
  4. Me2SiCl2
NEET 2013
7

The basic structural unit of silicates is

  1. SiO32-
  2. SiO42-
  3. SiO-
  4. SiO44-
NEET 2013
8

Which statement is wrong?

  1. Beryl is an example of cyclic silicate.
  2. Mg2SiO4 is orthosilicate.
  3. Basic structural unit in silicates is the SiO4 tetrahedron.
  4. Feldspars are not aluminosilicates.
NEET 2013 (Karnataka)
9

Name the type of the structure of silicate in which one oxygen atom of [SiO4]4- is shared.

  1. Linear chain silicate
  2. Sheet silicate
  3. Pyrosilicate
  4. Three dimensional
AIPMT 2011 (Prelims)
10

The tendency of BF3, BCl3 and BBr3 to behave as Lewis acid decreases in the sequence

  1. BCl3 > BF3 > BBr3
  2. BBr3 > BCl3 > BF3
  3. BBr3 > BF3 > BCl3
  4. BF3 > BCl3 > BBr3
AIPMT 2010 (Prelims)
11

The stability of +1 oxidation state among Al, Ga, In and Tl increases in the sequence

  1. Al < Ga < In < Tl
  2. Tl < In < Ga < Al
  3. In < Tl < Ga < Al
  4. Ga < In < Al < Tl
AIPMT 2009

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